That'd have to be an awfully slim pillion!
Not too much info, just corrupted data, something that wasn't compatible that's gone on to corrupt everything else. Not malicious, just "one of them fings" as we computer wizzkids say.
Yodie says it could be as simple as an incorrect dot in a code somewhere. He's been beavering away deleting all the infected data, which is why he's had to go back 5 weeks to get back to "clean" data.
When it broke down he had to roll up his sleeves & get in there & fix it while I just hovered anxiously in the background, wringing my hands & constantly saying "Is it fixed yet Yodie?"
Please try not to break it again.